Knife sharpener



March 29, 1932. G. A. MoLLER KNIFE SHARPENER Filed Oct. 17, 1929 @601:96 @lkw/@05561; 3a/wal,

Patented Mar. 2.9, v1932 UNITED s'larss PATENT OFFICE4 GEORGE ALBIN MULLER, F CHICAGO, ILLINOIS, SSIGNOR 0F ONE-HALFl v'.IO EMIL RICHARD MOLLER, OF CHICAGO, ILLINOIS l KNIFE SHARPENER Application lectober 17, 1929'. SerialvNo. 400,407.

This invention relates to improvements in knife Sharpeners and has especial reference to such devices for household use.

The object of the 4invention is to provide a simple?, durable, cheap, and eiiicient device of this character.

A special feature of the invention is'that .the sharpening elements 'are easily and readily renewable. A further feature relates to the reversibility of the sharpening elements, thus giving the device a relatively long hfe.

Many other advantageous features of construction and use will become apparent from the following specification taken in conjunction with the accompanyinfrdrawings, and such features are particular the appended claims.

In said drawings Fig. 1 is an end elevation of the device;

Fig. 2 is a plan section on the line 2 2 of Fig. 1

Figs. 3 and 4 are vertical sections on the line 3 3 of Fig. 4 and showing two different positions of the knife which is being sharpened Fig. 5 is an end elevation showing the parts of the holder swung around in relation to each other to facilitate the removal and replacement of the cutting elements; and

Fig. 6 is a side elevation of the device as shown in Fig. 5. i

Thedevice as shown consists of two frame or holding parts 1 and 2. These frame parts are exactly alike and can be f orined by the one set of tools and dies.

The frame'parts are formedto removably holdtwo cutting or grinding elements 3 and 4 which serve to do the-actual sharpening.

Each frame part consists of a fiat, base portion 5, a middle flat standard portion 6, and a cutting element holdingportion 7.

The two frame parts 1 and 2 are adapted to be securely clamped together at one point by a hollow rivet 8 which joins the two fiat standard-portions and pivots one upon the other, so that'they can be swung around upon" y pointed out in` each consists of a cylindrically formed back with bent-in ears 9 at its ends, which serve to retain the cuttingelements 3 and 4 against removal when the parts are in working position, as shown in Fig. 1; The upper edges 10 of the holding parts 1 and 2 areflared outwardly to avoid any sharp edges which might catch and. hold the cutting elements.

,The base portions are each provided with a hole 1l to receive a screw in securing the device in position upon port for use. l l

The cutting elements 3 and 4 are preferably made of carborundum, or some similar hard cutting or abrasive material: They are quite hard and are molded or formed in a '60 a table Aor other suppeculiar shape which greatly facilitates the production of sharp edges on knives, etc.

The cutting elements are exactly alike, or

duplicates. This reduces costs similar to the saving effected `in the frame parts.

Each cutting element is formed as a section of a cylinder having a cylindrical back 12 which fits in the cylindrical part 7 of the holder.- The inner side of each cutting ele# ment vis a curved surface 13 produced on a much greater radius. These two inner curved surfaces 13 are held tightly in contact with each other by the resiliency of the holders. This form of cutting elements provides a very sharp V-opening 14 to receive a knife blade 15 to be sharpened. l

In sharpening a knife blade by means of this device, the blade is first laid against one of the surfaces 13 of one of the elements, and its edge is pressed against the opposite eleproduction of the y ment and the knife is drawn lengthwise through the device.

two holder arts are rotated in relation to with the work, the holder being provided each other illirough 90 degrees, the cutting with an open tog through which the abrasive elements are free to be removed. The holder elements may e removed when they are parts are so formed that they have tobe swung around in said cylindrical opening 5 sprung out slightly to place the two cutting approximately 45 degrees from their norma 70 elements in operative position, and this causes workin posltions. i the two cutting elements to be pressed tightly In witness that I claim the foregoing as against each other and prevents the knife my invention, I aiiix my signature this 14th edge from workin down betweenthem. day of October, 1929.

It is to be noted that the flared out edges GEORGE ALBIN MOLLER. 75

10 of the holders 7 are spaced wider apart than the adjacent corners or edges of the cutting elements. By this means, portions of the outer cylindrical surfaces 12 of the` 15 cutting elements 3 and 4 are exposed adja- `90 cent to the flanges 10. rI`he object of this is to provide means for readily sharpening scissors or shears. The flanges 10 serve as stop guides for the blades of such cutting instruments as they are drawn lengthwise g5 with their cutting edges in contact with the cutting elements.

It is to .be noted that the flanges or guide stops 10 are spread apart sulliciently so that the opening provided between them is wide 90 enough to permit the abrasive elements-4 to be removed through lsaid opening one at a time.

lIt is only necessary to rotate the two ele- 80 ments 4 in the holder about 30 degrees to 95 position one of the elements so that it can be f taken out through said opening and, after this is done, the other element can be removed. This is a convenience for renewing wornelements without the necessity of disl 100 mounting the device after it has been sel cured in place for use.

The device is extremely simple, strong, durable and eective.

40 As many modifications of the invention 105 will readily suggest themselves to one skilled in the art,/I do not limit or confine the invention to the specific details of construction herein shown and described. I claim: i l v 110 Il. In a device of thekind described, two abrasive elements having convex curved surfaces for contact with each other to provide a V-shaped opening for receiving a knife blade, the opposite sides of the elementsl be- 115 ing` cylindrical in shape, holding members for said elements, said members having Shanks contacting on the center plane of said opening, and pivot means securing said shanks together and said members being ca- 120 pable of being swung out of alignment on said securing means to facilitate the removal and replacement of said elements. 2. In a device of the kind described, a holder for abrasive elements, the.. holder pro. vided with a cylindrical opening, stop pro- ]ect1ons at the ends of the opening, a pair of abrasive elements having cylindrical outer surfaces for engagement in said opening and inner convex sides for operative engagement 13G 

